JPH0748409Y2 - Ventilation structure behind the rear bumper of an automobile - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an improvement of a ventilation structure in which a ventilation opening provided at a rear side of a vehicle body side of a vehicle is covered with a rear bumper.

[Prior Art] Conventionally, as shown in FIG. 9, FIG. 10, and FIG.
There is known a ventilation structure in which a ventilation opening E is provided in a vehicle body outer plate D which is covered by a side portion C of a rear bumper B behind a side portion of a vehicle body A. Through the indoor exhaust holes f provided in the package tray trim F, the upper back reinforcement H, and the quarter vent duct I from the ventilation port E provided in the vehicle body outer plate D to the vehicle body outer plate D. It is discharged into the hollow portion J surrounded by the side portion C of the rear bumper B and discharged from the upper and lower surfaces of the rear bumper B to the outside of the vehicle.

In a vehicle equipped with the above ventilation structure, the blower of the air conditioner is stopped, the inside / outside air switching lever is set to the inside air mode, the window is opened by about 10 cm, and the pressure distribution when traveling at various vehicle speeds is
As shown in FIGS. 10, 10 and 11, a point a above the rear portion of the rear bumper B at the rear portion of the vehicle body A, a point b on the rear side of the rear bumper B in the hollow portion J of the rear bumper B, and the rear bumper B A point c behind the side part C, a point d close to the ventilation port E,
Measured at the point e of the ventilation port, the point f of the indoor exhaust hole of the package tray trim F, and the point g of the air outlet of the instrument panel G, and using the pressure of the indoor exhaust hole f as a reference, the differential pressure The pressure distribution is as shown in FIG. 12, and the point a at the upper rear of the rear bumper B at the rear of the vehicle body A passes through the points b, c and d in the hollow portion J of the rear bumper B to the point at the ventilation port. It is clearly recognized that the pressure becomes extremely low as it reaches e.

Therefore, when the vehicle is running, the dust-containing outside air wound up by the tires or the like enters the cavity portion J surrounded by the vehicle body outer plate and the rear bumper B from the rear upper surface of the rear bumper B, as shown in FIG. There is a risk of entering the vehicle interior through the ventilation port E provided on the outer plate of the vehicle body.

Therefore, Japanese Utility Model Laid-Open No. 61-108611 discloses that the butterfly check valve K is provided in the ventilation port E provided in the vehicle body outer plate D as shown in FIG. In the configuration in which the butterfly check valve K is provided, the butterfly check valve K may move up and down or may be curved and deformed due to the vibration of the vehicle while the vehicle is running, and the ventilation port E may not be sufficiently closed.

Further, it is conceivable to increase the weight of the butterfly check valve K to prevent the butterfly check valve K from moving up and down or curving due to vibration during traveling of the vehicle. However, if the weight of the butterfly check valve K is increased. However, there is a problem that the air in the vehicle compartment is less likely to escape from the ventilation port E of the vehicle body outer plate D, and the ventilation performance is deteriorated.

[Problems to be Solved by the Invention] In view of the above-mentioned problems of the conventional technology, the present invention is surrounded by a vehicle body outer panel and a rear bumper without deteriorating the ventilation performance of a ventilation opening formed on the rear side of the vehicle body. It is an object of the present invention to prevent the dust-containing outside air that has entered the hollow portion from flowing back into the vehicle compartment from the ventilation port.

[Means for Solving the Problems] In order to solve the above-described problems, the present invention is directed to a case where a ventilation opening provided in a vehicle body outer plate at a rear side of a vehicle body is covered with a side portion of a rear bumper, A cavity is formed between the side of the rear bumper and one opening of the duct disposed on the rear side of the rear bumper is opened at a site where negative pressure is generated during traveling, The other opening is configured to be opened in a portion of the hollow portion close to the ventilation port.

[Operation] As described above, the present invention has a cavity portion surrounded by a vehicle body outer plate portion having a ventilation opening for communicating the inside and outside of a vehicle and a side portion of a rear bumper, and a negative pressure when the vehicle is running. Since the duct communicates with the part in which the air is generated, the dust-containing outside air that has entered the hollow portion is discharged through the duct to the part in which negative pressure is generated when the vehicle is running, and the dust-containing air that has entered the hollow portion. Backflow of dust outside air into the passenger compartment is prevented.

[Embodiment] FIGS. 1 to 4 show a first embodiment of the present invention.

A ventilation port 3 for communicating the inside and outside of the vehicle interior and discharging the air in the vehicle interior is provided in the rear side 2 of the vehicle body outer plate 1.
Is covered by a side portion 6 of the rear bumper 5, and hollow portions 4 and 8 are formed between the rear bumper 5 and the vehicle body outer plate 1.

A duct 11 is disposed in hollow portions 4 and 8 surrounded by the vehicle body skin 1 and the rear bumper 5, and one opening 14 of the duct 11 is a ventilation port provided in the vehicle body skin 1. 3 is opened in the hollow portion 8 near the rear portion of the vehicle, and the other opening 12 is opened in the lower rear surface of the rear bumper 5, which is one of the portions where negative pressure is generated when the vehicle travels.

In the vehicle with the above structure, stop the blower of the air conditioner, set the inside / outside air switching lever to the inside air mode, and open the window
The pressure distribution when traveling at various vehicle speeds with 10 cm open
As shown in FIGS. 3 and 4, a point L above the rear part of the rear bumper 5, a point M on the rear side of the rear bumper 5 in the cavity 4 of the rear bumper 5, and a point N facing one opening 14 of the duct 11. , The point O close to the ventilation port 3 and the point P in the ventilation port 3 are measured, and the difference between them is based on the pressure at the point f of the indoor exhaust hole portion of the package tray trim F shown in FIG. In terms of pressure, the pressure distribution shown in FIG. 5 is obtained.

Therefore, when the vehicle is traveling, the hollow portion 4 surrounded by the vehicle body skin 1 and the rear bumper 5 from the upper surface of the rear portion 9 of the rear bumper 5,
The dust-containing outside air that has entered the inside 8 is sucked from one opening 14 of the duct 11 along the air flow shown in FIG.
It is discharged to the outside of the vehicle from an opening 12 in the lower surface of the rear portion 9 of the rear bumper 5, which is one of the negative pressure generating portions when the vehicle is traveling.

Therefore, it is possible to prevent the dust-containing outside air that has entered the hollow portions 4 and 8 of the rear bumper 5 from the upper surface of the rear portion 9 of the rear bumper 5 through the ventilation port 3 and into the vehicle interior.

Further, FIGS. 6 to 8 show the second embodiment, in which a partition plate 7 for partitioning one opening 14 of the duct 11 and the ventilation opening 3 provided in the vehicle body outer plate 1 is provided with a rear bumper. 5 is provided on the side portion 6 of the rear bumper 5, and enters the hollow portion 8 of the rear bumper 5 from the rear portion 9 of the rear bumper 5 and escapes one opening 14 of the duct 11 to flow the airflow 10 toward the ventilation opening 3. By weakening, it is possible to enhance the ability of the duct 11 to discharge dust-containing outside air.

In addition, in the hollow portion 4 of the rear portion 9 of the rear bumper 5, an opening is made at the bottom.
The suction force of the duct 11 is obtained by arranging a hollow box-shaped portion 13 having 15 and allowing the opening 15 of the hollow box-shaped portion 13 to face the opening portion provided on the lower surface of the rear portion 9 of the rear bumper 5. Can be increased.

In each embodiment, the duct 11 is opened on the lower surface of the rear portion of the rear bumper, but the duct 11 is not limited to that portion, and may be any portion where a negative pressure is generated when the vehicle is traveling.

Further, in each of the embodiments, the duct 11 is arranged in the hollow portion surrounded by the vehicle body outer plate 1 and the rear bumper,
It may be arranged so as to penetrate the vehicle body outer plate 1.

[Advantages of the Invention] The present invention provides a duct that connects a hollow portion surrounded by a vehicle body outer panel facing the ventilation opening formed in the vehicle body outer panel and a side portion of the rear bumper and a portion where negative pressure is generated when the vehicle is running. Since it is provided, the dust-containing outside air that has entered the cavity can be discharged to the outside of the vehicle through this duct, preventing the entry of dust-containing outside air into the vehicle interior without lowering the ventilation performance in the vehicle interior. It has a unique effect of being able to do it.

[Brief description of drawings]

1 to 4 show a first embodiment,
The figure is a schematic oblique view of the rear right side of the vehicle body with the rear bumper omitted, FIG. 2 is a schematic oblique view of the rear right side of the vehicle body shown in FIG. 1, and FIG. 3 is a sectional view taken along line III-III in FIG. FIG. 4 is a schematic right side view of what is shown in FIG. 1, FIG. 5 is a diagram showing the pressure distribution in the first embodiment, and FIGS. 6 to 8 are the second embodiment. 6 is a schematic perspective view of the rear right side of the vehicle body with the rear bumper omitted, and FIG.
FIG. 8 is a right side view of what is shown in FIG. 8, and FIG. 8 is VIII-VIII in FIG.
Line sectional views, FIG. 9 to FIG. 11 show an example of a conventional device, FIG. 9 is a perspective view showing a rear view of a vehicle as a partial cross section, and FIG. FIG. 11 is a schematic oblique view of the rear right side of the vehicle body, FIG. 11 is a sectional view taken along the line XI-XI in FIG.
FIG. 9 is a diagram showing the pressure distribution of what is shown in FIG. 9, FIG. 13 is an explanatory view showing the flow of dust-containing outside air on the rear bumper rear surface of FIG. 10 and FIG. 11, and FIG. 14 is another conventional device. FIG. 3 is a vertical cross-sectional view of the ventilation port portion of FIG. 1: Body shell, 2: Rear side, 3: Ventilation port, 4, 8: Hollow part, 5:
Rear bumper, 6: side, 11: duct, 12, 14: opening.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A ventilation opening provided in a vehicle body outer plate at the rear of a vehicle body side portion is covered with a side portion of a rear bumper, and a hollow portion is formed between the vehicle body outer plate and the side portion of the rear bumper. , One opening of a duct disposed on the rear side of the rear bumper is opened at a site where negative pressure is generated during traveling, and the other opening of the duct is connected to the ventilation port in the hollow portion. Ventilation structure on the back side of the rear bumper of the car, which is opened in the vicinity.